A benzimidazolyl terpyridine-Fe2+ system and its recognition driven molecular model of a traffic light

Avinash Kumar Sonkar; Abhishek Rai; Kamini Tripathi; Pooja Sharma; H. W. Roesky; Michael G. B. Drew; Lallan Mishra

doi:10.1039/C8DT03690J

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A benzimidazolyl terpyridine-Fe²⁺ system and its recognition driven molecular model of a traffic light†

Avinash Kumar Sonkar,^a Abhishek Rai,^a Kamini Tripathi,^a Pooja Sharma,^b H. W. Roesky,

*^c Michael G. B. Drew^d and Lallan Mishra

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India
E-mail: lmishrabhu@yahoo.co.in

^b Department of Chemistry, Guru Nanak Dev University, Amritsar-143005, Punjab, India

^c Institute of Inorganic Chemistry, University of Göttingen, Tammannstrasse 4, Göttingen, Germany

^d Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, UK

Abstract

A new benzimidazolyl terpyridyl ligand (BIT) selectively detects Fe²⁺, F⁻ and CN⁻ ions in acetonitrile. The Fe²⁺ complex [Fe(H-BIT)₂]·(ClO₄)₄ (1) displays the fast and selective detection of 2,4,6-trinitrophenol (TNP) with strong binding (log β = 8.51 ± 0.24) and a low limit of detection (1.4 × 10⁻⁷ M) among several nitroaromatics. The color of complex 1 changes from purple to red, yellow, and green upon the separate addition of 2,4,6-trinitrophenol and tetrabutylammonium salts of fluoride and cyanide, respectively. The overall color changes thus display a model of a traffic light. The structures of BIT, 1 and [Fe(BIT)₂]·(TNP)₂ (2) have been well characterized using spectroscopic techniques and single crystal X-ray crystallography.

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Article information

DOI: https://doi.org/10.1039/C8DT03690J
Article type: Paper
Submitted: 12 Sep 2018
Accepted: 26 Nov 2018
First published: 27 Nov 2018

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Dalton Trans., 2019,48, 158-167

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A benzimidazolyl terpyridine-Fe²⁺ system and its recognition driven molecular model of a traffic light

A. K. Sonkar, A. Rai, K. Tripathi, P. Sharma, H. W. Roesky, M. G. B. Drew and L. Mishra, Dalton Trans., 2019, 48, 158 DOI: 10.1039/C8DT03690J

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